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I have a Galaxy S6 edge at home and I have some old speakers.
I connect my phone to the speaker using jack 3.5mm output and play music with my Spotify account remotely by selecting my phone in the device list.
The thing is that I can't control the volume, and I want to know if I can use a sort of API or anything else to control it like a real Sonos or any Wifi speaker or do I need to buy a real one ?